ucore作業系統學習(五) ucore lab5使用者程式管理
- ucore lab5介紹
ucore在lab4中實現了程式/執行緒機制,能夠建立並進行核心執行緒的排程。通過上下文的切換令執行緒分時的獲得CPU,使得不同執行緒能夠併發的執行。
在lab5中需要更進一步,實現我們平常開發接觸到的、執行在使用者態的程式/執行緒機制。使用者執行緒通常用於承載和執行應用程式,為了保護作業系統核心,避免其被不夠魯棒的應用程式破壞。應用程式都執行在低特權級中,無法直接訪問高特權級的核心資料結構,也無法通過程式指令直接的訪問各種外設。
但應用程式訪問高特權級資料、外設的需求是不可避免的(即使簡單的列印資料到控制檯中也是在對顯示卡這一外設進行控制),因此ucore在lab5中也實現了系統呼叫機制。應用程式平常執行在使用者態,在有需要時可以通過系統呼叫的方式間接的訪問外設等受到保護的資源。
系統呼叫介紹
系統呼叫是作業系統提供的一種特殊api介面,底層是通過中斷實現的。應用程式呼叫系統中斷時,其CPL特權級會被暫時的提升到ring0,因此便獲得了訪問外設、核心資料的能力。這一提升CPL特權級從外層使用者態到裡層核心態的過程,也被稱為陷入核心(系統呼叫會陷入核心,但是陷入核心的方式除了系統呼叫外,還包括觸發保護異常等)。
由於系統呼叫是作業系統的開發人員精心設計的,且對傳入的引數等等有著很嚴格的控制,確保了系統呼叫不會對核心造成破壞。同時,在系統呼叫中斷返回時,也會將其CPL特權級對應用程式透明的還原到使用者態。在ucore的lab5中,提供了一些使用者態的demo應用程式,並在核心實現了諸如fork、exit、kill、yield、wait等等系統呼叫功能以及C實現的應用程式系統呼叫庫。
通過lab5的學習,可以更深入的瞭解作業系統中使用者態應用程式的載入、執行和退出機制,以及系統呼叫的工作原理。
lab5是建立在之前實驗的基礎之上的,需要先理解之前的實驗內容才能順利理解lab5的內容。
可以參考一下我關於前面實驗的部落格:
1. ucore作業系統學習(一) ucore lab1系統啟動流程分析
2. ucore作業系統學習(二) ucore lab2實體記憶體管理分析
3. ucore作業系統學習(三) ucore lab3虛擬記憶體管理分析
4. ucore作業系統學習(四) ucore lab4核心執行緒管理
- ucore lab5實驗細節分析
下面通過解析lab5實驗的原始碼,進一步分析在ucore中載入、並執行一個使用者態應用程式的機制,以及系統呼叫是如何實現的。
2.1 lab5中執行緒控制塊的變化
lab5中引入了使用者程式/執行緒機制,使用者程式/執行緒會隨著程式的執行不斷的被建立、退出並銷燬。同時也引入了父子程式的概念,在子程式退出時,由於其核心棧和子程式自己的程式控制塊無法進行自我回收,因此需要通知其父程式進行最後的回收工作。2.2 系統呼叫的實現原理
系統呼叫貫穿著整個lab5實驗的內容,只有理解了系統呼叫的實現原理後才能更進一步的理解lab5給出的demo程式中應用程式載入、執行及退出的機制。
系統呼叫是提供給執行在使用者態的應用程式使用的,且由於需要進行CPL特權級的提升,因此是通過硬體中斷來實現的。
ucore在初始化中斷描述符表的/trap/trap.c的idt_init函式中,在前面實驗的基礎上額外設定了一個用於系統呼叫的中斷描述符。 ucore構造了一個當前系統所支援的系統呼叫處理表(syscalls陣列),根據系統呼叫中斷時傳入的系統呼叫號(儲存在eax中),跳轉執行對應的系統呼叫邏輯。
ucore的系統呼叫允許通過edx、ecx、ebx、edi和esi這5個暫存器傳遞最多5個引數,並且在對應的系統呼叫邏輯完成後通過eax暫存器存放系統呼叫的返回值。另一方面,可以從ucore提供的在使用者態執行的系統呼叫庫函式實現中看到應用程式是如何發起系統呼叫的,主要邏輯位於/user/lib/syscall.c中。
庫函式syscall.c中不同的系統呼叫最終都通過syscall函式進行統一處理,syscall通過內聯彙編的形式,執行了int i 0x80(T_SYSCALL)以發起系統呼叫中斷。系統呼叫號num賦值給了eax(a),且將需要傳遞的引數賦值(a[i])分別給了edx(d)、ecx©、ebx(b)、edi(D)和esi(S),且令返回值ret等於中斷返回後的eax(=a ret)。
可以通過互相比對呼叫方使用者態syscall.c庫函式以及核心中的syscall實現,加深對系統呼叫工作機制的理解。在前面的實驗中提到過,如果包括系統呼叫在內的中斷髮生時,80386CPU將會在中斷棧幀中壓入中斷髮生前一刻的CS的值。如果是位於ring3使用者態的應用程式發起的系統呼叫中斷,那麼核心在接受中斷棧幀時其CS的CPL將會是ring3,並在執行中斷服務例程時被臨時的設定CS的CPL特權級為ring0以提升特權級,獲得訪問核心資料、外設的許可權。
在系統呼叫處理完畢返回後,iret指令會將之前CPU硬體自動壓入的cs(ring3的CPL)彈出。系統呼叫處理完畢中斷返回時,應用程式便自動無感知的回到了ring3這一低特權級中。
2.3 應用程式的載入
lab4在總控函式kern_init中通過proc_init建立了兩個核心執行緒idle_proc和init_proc,其中init_proc只是單單在控制檯中列印了hello world。
但lab5中在init_proc中fork了一個核心執行緒執行user_main,在user_main中執行了sys_execve系統呼叫,用於執行BIOS引導時與ucore核心一起被載入到記憶體中的使用者程式/user/exit.c,讓exit.c在使用者態中執行。(之所以要以這種方式載入exit.c是因為ucore目前還沒有實現檔案系統,無法以檔案的形式去載入二進位制的應用程式)exit.c使用者程式的載入
在usermain中,通過kernel_execve函式,在核心態發起了系統呼叫號為SYS_exec的系統呼叫。通過前面對系統呼叫機制的介紹,kernel_execve函式發起系統呼叫號為SYS_exec編號的系統呼叫後,最終邏輯會執行到系統呼叫處理表syscalls中的對應的sys_exec函式中。
sys_exec接受四個引數,arg[0]和arg[1]用於指定所要建立、執行的執行緒名以及其字串長度;arg[2]和arg[3]用於指定對應elf格式的二進位制程式在記憶體中的地址以及程式的大小。在sys_exec的核心邏輯位於其呼叫的do_execve中。do_execve函式解析:
在視訊的實驗公開課中提到,do_execve實現的大致原理就是令被載入的binary二進位制程式藉著當前執行緒的殼,用被載入的二進位制程式的記憶體空間替換掉之前執行緒的記憶體空間,達到騰籠換鳥的目的。
具體到程式碼中來,可以看到在進行了基礎的校驗之後,do_execve首先一步就是將當前執行緒current對應的mm_struct替換掉,且如果發現被替換掉的mm_struct沒有再被其它執行緒共享,則將其徹底銷燬釋放。之後通過一個較為複雜的load_icode函式,解析對應的binary二進位制程式,生成一個完全不同的,屬於被載入程式的mm_struct。
對當前執行緒current對應的記憶體總管理器mm_struct的一刪一增,導致current當前執行緒所執行的程式碼段、所屬的資料段和之前完全不同,巧妙的實現了藉著之前執行緒的殼,重新執行一個截然不同的程式的目標。從這裡也能更深入的體會到靜態的程式與動態的程式/執行緒的關係。load_icode函式解析:
load_icode函式是lab5中十分核心、重要的一個部分。在load_icode中,按順序執行以下幾個步驟,為需要載入執行的新程式構造了完整的執行環境。
1. 為當前程式建立一個新的mm結構。
2. 為新的mm分配並設定一個新的頁目錄表。
3. 在二進位制資料空間中分配記憶體(虛擬、實體記憶體空間),從elf格式的二進位制程式中複製出對應的程式碼/資料段,並初始化BSS段(需要對ELF格式的檔案有一定的瞭解)。
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4. 為當前程式建立、分配對應的使用者棧。
5. 將前面構造好的新的mm_struct結構與當前執行緒關聯起來。
6. 為了令當前應用程式能夠在載入後順利的回到使用者態執行,需要構造對應的中斷棧幀(設定中斷返回時的應用程式入口以及使用者態許可權的程式碼段暫存器、資料段、棧段暫存器等等)。在中斷返回後欺騙CPU,令CPU以為當前執行緒在之前發生了一次特權級切換的中斷(其實已經是一個和之前執行緒完全不同的新程式了)。
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